How do I mod my console (PS3, Xbox 360, PS4, Xbox One)?

Console versions are not supported on this site - all mods here are for PC only.

Can I use these mods for online use?

No. The mods on this site are generally designed for singleplayer use only, and discussions about modding GTA: Online with the intent of cheating are not supported or allowed. Furthermore, your RGSC account may get banned by Rockstar for using mods online.